Lifting-jack.



w. w. BELL.

LIFTING JACK.

APPLICATION FILED MAY 5. I915.

Patented Mar. 21, 1916.

mmvrb/e William W Be 1L.

WITNESSES:

A TTOHA IEY 1m: COLUII\8(A PLANOGRAPH co.. wAsmnm-on. n. c.

WILLIAM W. BELL, OF VALLEY SPRINGS, SOUTH DAKOTA.

LIFTING-J'ACK.

To all whom it may concern Be it known that I, \VILLIAM IV. BELL, a citizen of the United States, and a resident of Valley Springs, in the county of Minnehaha and State of South Dakota. have in vented a new and Improved Lifting-Jack, of which the following is a full, clear, and exact description.

My invention relates to a lifting jack of that type, an example of which is shown in United States patent granted to me July 22, 1913, No. 1,068,205, in which spaced standards receive the handled lever therebetween, the fulcrum pin of the lever being movable vertically on the standards to adjust the height of the lever.

The object of the present invention is to provide a lifting jack of the indicated character, improved in various particulars, with a view to promote efliciency, and having the elements thereof so disposed that the strains in operating the jack will be distributed.

A further object of the invention is to increase the eflieieney of jacks of the indicated character and to promote convenience in the operation of the jack and in the adjustment of the parts.

The invention will be particularly explained in the particular description following.

Reference is had to the accompanying drawings forming part of this specification, in which similar characters of reference indicate corresponding parts in all the views, and in which:

Figure 1 is a side elevation of a jack embodving my invention: Fig. 2 is a vertical section on the line 22 of Fig. 1; and Fig. 3 is a cross section on the line 38 Fig. 1.

In constructing a practical embodiment of my invention in accordance with the illustrated example, two side standards 10 are provided having a suitable base 11 and spaced to receive the lifting lever 12. The standards at their upper ends have a transverse bolt 13 and a spacing bl ck 13 The fulcrum pin 14 is carried by the lever 12 and extends trans ersely therethrough and through the standards 10 and preferably has washers 15, outside of the standards. The fulcrum pin is verticallv movable in slots 16 in the standards. the forward Walls of which slots are formed with notches Specification of Letters Patent.

Application filed May 5, 1915.

Patented Mar. 21, 1916. Serial No. 25,990.

16 to receive said pin. The fulcrum pin 11- carries links 17 at each side of the lifting lever 12, the fulcrum pin passing through the links at points between the upper and lower ends of the latter. At the upper projecting ends of the links 17 a fulcrum pin 17 is provided, on which is fulcrumed an auxiliary lifting bar 18 ranging lengthwise of the lever 12 at the forward end and extending between the standards 10, said auxiliary bar being supported at each end on links 19 which are pivc-tally connected with said auxiliary bar and the lever 12. The position of the bar 18 with respect to the lever when the latter is about to be raised, is shown in Fig. 1. The forward end of the bar 18 has suitable formation to prevent slipping of the jack from the load, there being shown in the present instance a toothed or roughened surface 18. \Vith the surface 18 brought to bear against the load to lift the latter, when the lever handle is moved downwardly and the front end raised. there will be a differential movement of the lever and the bar 18 owing to the separate fulcrums thereof on the links 17, so that as the front end of the lever rises, the bar 18 will shift forwardly and rise, thereby giving an auxiliary lifting movement in addition to the direct lifting movement of the lever 1.2.

The links 17 carry at their lower ends a pawl 21 mounted on a pivot pin 20 pass ng through said links and throu h the vertical slots 16, the pawl being adapted to engage notches 22 on the underside of the le er and be ng weighted at its rear end as at 21. To displace the pawl. a lonqitudinallv movable rod is disposed on the lever. bein connected with an operating lever 24 at the handle of the lever 12 and having guided mo ement in a strap 23 or the like. on the underside of the lever between the standards.

In the lifting ope ation of the jack, the fulcrum pin 14 tends to move rearwardly against the back wall of the slots 16. In my present invention I provide an element 25 preferably in the form of a plate spring which is secured to the pin 20 of the pawl 21 by a nut 20 and extends upwardlv adjacent to the fulcrum pin at the rear of the latter. The width of the spring 25v is less than that of the adjacent slot 16 and said spring has an inward bend 25* adapted to enter the said slct.

In practice the spring 25 being positioned with its bend 25 in the slot 16, and the upper end of spring in the rear of the fulcrum pin 14, a lifting movement of the lever 12 will cause the fulcrum pin to move rearwardly against the forward edge of the spring 25 and to bind the said spring at the bend 25* thereof against the rear wall of the slot 16. The strain exerted by the fulcrum pin will thus be to some extent distributed instead of being lccalized at a particular point on the standard, so that there is less tendency of the standard to split. However, I provide on each end of the bolt 20 transverse slides 26, the ends 26 of which embrace the front and back edges of the standards and thus effectively prevent splitting of the standards. It will thus be seen that the spring 25 for retaining the fulcrum pin ll and receiving the strain thereof is carried by and movable vertically with the lifting lever, and that similarly, the reinforcing slides 26 move with the lever through the connection of the links 17 and maintain their uniform distance from the fulcrum pin, so as to be effective adjacent the point of strain.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A lifting jack comprising a support, a lifting lever fulcrumed on the support and verticallv ad ustable thereon, and an element to hold the lever in an adjusted position and receive the thrust thereof, when rocked on its fulcrum, said element being movable vertically with the lever.

2. In a lifting jack, a support having a vertical series of notches, a lifting lever having a fulcrum pin and vertically movable with said fulcrum pin to engage the fulcrum pin in either notch, and means adjustable vertically with the adjustment of the lever, and movable into engagement with the fulcrum pin to hold the same in a notch.

3. In a lifting jack, a support having a vertical slot and nctches in a wall of the slot, a lifting lever having a fulcrum pin adjustable in the slot to engage either of the notches, and an element movable trans- Oopies of this patent may be obtained for versely into or out of the slot adjacent to the fulcrum pin to receive the thrust of the latter when the lever is operated.

4. In a lifting jack, a support having a vertical slot and notches in the wall of the slot, a lifting lever having a fulcrum pin adjustable in the slot to engage either of the notches, and an element movable transversely into or out of the slot adjacent to the fulcrum pin to receive the thrust of the latter when the lever is operated, said element having connectirns with the lever to move vertically therewith.

5. In a lifting jack, a support having a vertical slot and notches in a wall of the slot, a lifting lever having a fulcrum pin movable in the slot to enter either notch, a spring lock to hold the fulcrum pin in a notch, said spring being supported to move vertically with the vertical adjustment of the lever, and movable laterally to project a part thereof into the slot of the support adjacent to the fulcrum pin.

6. In a lifting jack, a support, a lifting lever pivotally mounted on the support, a link supported on the lever, means carried by the link to engage the pivot of the lever and receive the rearward thrust thereof and a slide carried by the link and embracing the support at the front and back.

7. In a lifting jack, a support, a lifting lever fulcrumed thereon, an auxiliary bar rockably mounted on the lever above the same, and movable by and with said lever, and means to rock the lifting bar relatively to the lever in addition to its bodily rocking movement with the lever.

8. In a lifting jack, a support, a lifting lever fulcrumed thereon, an auxiliary lifting bar carried by the lever, above the same, links connecting the said bar at its ends with the said lever, and a link pivotally connecting the said bar with the lever between the ends of the bar.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WILLIAM \V. BELL.

Witnesses C. O. JOHNSON, L. S. HETLAND.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

